#web_bg{
    position: fixed;
    top: 0;
    left: 0;
    background-image: url("../imgs/bgc.png");
    background-repeat: no-repeat;
    height: 100%;
    width: 100%;
    z-index: -10;
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    background-position: center 0;
}
#index_title{
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #8a6084;
    display: flex;
    flex-direction: row;
    justify-content: center;
    font-size: 25px;
    font-weight: bolder;
    margin-bottom: 15px;
}
#web_form{
    width: 25em;
    height: 100%;
    position: fixed;
    margin-left: -200px;
    margin-top: -170px;
    top: 50%;
    bottom: 50%;
    left: 50%;
    right: 50%;
}
#login{
    width: 25em;
}
#register{
    width: 5em;
    margin-left: 10.5em;
    margin-top: 20px;
    border: 1px solid #fff;
}
#web_form form{
    width: 25em;
}
@media screen and (max-width: 800px) {
    #web_form{
        width: 15em;
        height: 100%;
        position: fixed;
        margin-left: -7.5em;
        /*margin-top: -40px;*/
        top: 50%;
        bottom: 50%;
        left: 50%;
        right: 50%;
    }
    #login{
        width: 15em;
    }
    #register{
        width: 4em;
        margin-left: 5.5em;
        margin-top: 1em;
        border: 1px solid #fff;
    }
    #web_form form{
        width: 15em;
    }
}